I purchased one of these this year:
changed the grip and hammer
When the local gunstore dropped the price to $329, I bought another. New grip and Tisas GI hammer
The sights on these are large, not GI.
shoots good
So far my Tisas 1911's are as accurate as I am with irons. I can do better with optical sights. The pistols reliably go bang, the brass is knocked in a 360 degree circle, which is a bit of a bother. I was able to pick the best of three at the Local Gunstore, and both of my Tisas's are amazingly tight. I called customer service, they said the sears were MIM. They said the slide and frame were 4605 steel. I could not find the material properties for 4605 steel, but did find properties for MIM 4605.
as sintered
Ultimate strength 84, Kpsia
Yield 47 Kpsia
Elongation 15%
Charpy Impact 40 ft/lb
quenched and tempered
Ultimate 215 kpsia
Yield 190 kpsia
Elongation 2%
Charpy 29 ft/lb
4605 looks to be an appropriate steel, the Charpy impact values for the sintered steel shows it is a tough steel, and that is what you want in a handgun,. Assuming there is a heat treat to make the metal to be strong enough for the loads, after that, you want a long fatigue life, and that is toughness.
you don't want this:
nor this (also from 1911 forum)
Just type in Cracked slide
https://www.1911forum.com/search/352131/?q=cracked+slide&o=relevance, or cracked 1911 at the 1911forum. Be surprised about the things you see.
https://www.1911forum.com/threads/tisas-1911-soft-steel.1048462/page-7
There was so much derp in this thread we had to sign up to respond:
- Tisas meets all NATO-spec and CIP certifications for manufacturing small arms. US-bound firearms meet SAAMI spec.
- Barrels/slides/frames are hammer forged and heat treated/stress relieved and are regularly tested.
- Slides/frames are machined from pre-hardened steel to prevent warping from post-machine heat treat. This slows cutting times and eats tooling but yields a more consistent product.
- Tisas has eliminated MIM parts with the exception of the recoil spring plug, once any remaining parts inventories have been consumed. All current production are machined parts.
Tisas has been a supplier of domestic and export government contract firearms since the 1990's. Everything from TT-33 pistols to PKM LMG's, 9mm duty pistols and M4 copies. We'll get a page set up here shortly to include them all, but remember that this is just a response to the old 'soft Turkish steel' story.
Composition of MIM 4605 is a low alloy steel.
Carbon 0.4-0.6%
Mo 0.2-0.5%
Ni 1.5-2.5%
I am sure the nickel helps in toughness. It is clearly superior to the WW2 materials.
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